You'll never convince me Chicago is/was colder than Candlestick. When the sun would start to go down and the shade would hit you it was like being ejected out of jet at 40,000'... instantly 50° below. AND...
When the fog would come in... it would rise over the wall's of Candlestick and then for some reason that defies physics swoop down to field level hitting one side of the stadium then sweep across the field hitting the people on the other side on it's way up and out of Candlestick... it was like getting slapped in the face.
My coldest day ever: Belmar, NJ. Right on the ocean. Howling wind and with the wind chill factor, (according to the radio), it was -17°
Also in NJ, when I was in the barracks at Fort Monmouth we should soak our sheets to tolerate the hot and humid nights. We did that one night... not sure, maybe Sept, and although it was near 80 with unbearable humidity when we took to our bunks we awoke at about 3am and it was 33°. and remember, we had wet sheets.